New answers tagged pbuilder
The issue is that debootstrap doesn't use your local keyrings in /etc/apt/trusted.gpg or /etc/apt/trusted.gpg.d/, but only uses the keyrings under /usr/share/keyrings/. From Debian 8 Jessie onwards, you can simply install the (official Debian) package ubuntu-archive-keyring and it should fix your issue. On earlier Debian releases, you could make pbuilder ...
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